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Two stars differ in colour. The blue one, compared with the red one, is:
AHotter
BColder
COlder
DNearer
Answer & Solution
Correct answer: A. Hotter
1. Blue light has the shorter wavelength.
2. Shorter peak wavelength means higher temperature.
3. So the blue star is hotter.
_Source: OpenStax Astronomy 2e, Chapter 5, Radiation and Spectra._
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